Move version requirements to crate-level docs

FEATURES.md

@@ -3,8 +3,8 @@
 Winit aims to expose an interface that abstracts over window creation and input handling and can
 be used to create both games and applications. It supports the following main graphical platforms:
 - Desktop
-  - Windows 7+ (10+ is tested regularly)
-  - macOS 10.7+ (10.14+ is tested regularly)
+  - Windows
+  - macOS
   - Unix
     - via X11
     - via Wayland
@@ -13,9 +13,6 @@ be used to create both games and applications. It supports the following main gr
   - iOS
   - Android
 - Web
-  - Chrome
-  - Firefox
-  - Safari 13.1+
 
 Most platforms expose capabilities that cannot be meaningfully transposed onto others. Winit does not
 aim to support every single feature of every platform, but rather to abstract over the common features
@@ -151,7 +148,6 @@ If your PR makes notable changes to Winit's features, please update this section
 * Setting the X11 parent window
 
 ### iOS
-* `winit` has a minimum OS requirement of iOS 8
 * Get the `UIScreen` object pointer
 * Setting the `UIView` hidpi factor
 * Valid orientations

src/platform/ios.rs

@@ -1,5 +1,8 @@
 //! # iOS / UIKit
 //!
+//! Winit has an OS requirement of iOS 8 or higher, and is regularly tested on
+//! iOS 9.3.
+//!
 //! iOS's main `UIApplicationMain` does some init work that's required by all
 //! UI-related code (see issue [#1705]). It is best to create your windows
 //! inside `Event::Resumed`.

src/platform/macos.rs

@@ -1,5 +1,8 @@
 //! # macOS / AppKit
 //!
+//! Winit has an OS requirement of macOS 10.11 or higher (same as Rust
+//! itself), and is regularly tested on macOS 10.14.
+//!
 //! A lot of functionality expects the application to be ready before you
 //! start doing anything; this includes creating windows, fetching monitors,
 //! drawing, and so on, see issues [#2238], [#2051] and [#2087].

src/platform/web.rs

@@ -1,5 +1,8 @@
 //! # Web
 //!
+//! The officially supported browsers are Chrome, Firefox and Safari 13.1+,
+//! though forks of these should work fine.
+//!
 //! Winit supports compiling to the `wasm32-unknown-unknown` target with
 //! `web-sys`.
 //!

src/platform/windows.rs

@@ -1,4 +1,7 @@
 //! # Windows
+//!
+//! The supported OS version is Windows 7 or higher, though Windows 10 is
+//! tested regularly.
 use std::{ffi::c_void, path::Path};
 
 use crate::{